T-Mobile USA is offering an iPhone 5 for free on activation when you switch from another carrier and trade in your current iPhone 4 or 4S. The offer is available through Father’s Day, June 16, and customers who take advantage of this deal will receive a $120 credit that can be put towards things like monthly payments, outstanding bills, or accessories. T-Mobile hopes that users looking at this offer will see the total value that T-Mobile wants to provide:

“Our message to iPhone 4S and iPhone 4 customers is simple: bring in your device and trade up to iPhone 5 on T-Mobile,” said Mike Sievert, chief marketing officer for T-Mobile. “We’re making it incredibly attractive to buy an iPhone 5 by pairing an un-beatable upfront price and trade-in offer with Simple Choice, the most hassle-free and affordable rate plan in wireless.”

The main barrier for users who want to take advantage of this offer would be the early termination fee from their current carrier. An ETF can be expensive, though if the customer has had their phone for awhile, it’s possible that the fee has decreased significantly. T-Mobile is likely hoping that customers will see this deal as a way to offset some of the costs. The offer continues T-Mobile’s aggressive push to stand out from the other major U.S. carriers and remain competitive. For those wanting to take advantage of the offer, remember that the iPhone goes on sale on T-Mobile starting this Friday, April 12.

If you have an iPhone 4 or 4S on another carrier, does this offer tempt you? Were you considering a switch anyway? Let us know in the comments below.